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Article 1. Geo Engineering Investigation And Evaluation Of A Proposed Construction Site In Apapa Area, Southwestern Nigeria

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Article 1. Geo Engineering Investigation And Evaluation Of A Proposed Construction Site In Apapa Area, Southwestern Nigeria


Topics
Boring, Geotechnical, Standard Penetration Test, Foundation, Triaxial test, Bearing capacity, Apapa, Southwestern Nigeria.
Collection
opensource
Language
English
Geotechnical investigation of the
subsurface was carried out in a proposed six storey building site at Barthrust
Road, Apapa, Lagos aimed at determining the stratigraphy and competency of the
shallow formations as foundation material. Field
investigation techniques such as borings, Standard Penetration Test and Cone
Penetration Test were carried out to fulfill the objective. A total of 3
boreholes were drilled upto depth of 30.0m while Cone penetration Test was
carried out upto depth of 3.25m. Samples from boreholes were sent to laboratory
for sieve analysis, Atterberrg limits, un-drained triaxial compression and
consolidation tests. Boring and
penetration tests revealed that the shallow subsurface is underlain essentially
by loose silty sand (0.0 – 1.50m) of friction angle 280 and
allowable bearing capacity of 29.0kN/m2 overlying medium dense silty
sand (1.50 – 14.50m) with angle of internal friction of 310. Beneath
these layers is soft silty sandy clay (14.50 – 16.0m) with cohesion of 35.0kN/m2
and angle of internal friction of 50 overlying a medium dense silty
sandy layer (16.0 – 21.0m) with angle of internal friction of 320.
These are further underlain by dense silty sandy layer (21.0 – 30.0) with an
angle of internal friction of 340 which is the most competent
foundation material. Grain size distribution analysis revealed that cohesion less soil
have d10, d30, d60, Cu, and Cc
range of 0.07 – 0.20, 0.18 – 0.80, 0.22 – 1.50, 1.6 – 21.4 and 0.50 – 2.40
respectively. Samples taken at depths approximately 0.0 – 19.0m are classified
as poorly graded pinpointing their susceptibility to liquefaction while those
at depths 19.0 – 30.0m are well graded. The allowable bearing capacity of the shallow foundation zone from the
topsoil to 1.50m shows low bearing capacities characteristics which are grossly
lower than the projected foundation loading. Pile driven to competent layer at
18.0m is recommended as foundation option for consideration for the proposed
structure.
Addeddate
2016-08-30 21:03:22
Identifier
Article1.GeoEngineeringInvestigationAndEvaluationOfAProposedConstructionSiteInAp
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ark:/13960/t0vq7st35
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